package edu.utdallas.alps.filters;

import java.io.IOException;
import javax.servlet.DispatcherType;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Servlet Filter implementation class LoginFilter
 */
public class LoginFilter implements Filter {

	private FilterConfig config;
    /**
     * Default constructor. 
     */
    public LoginFilter() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		// place your code here
		System.out.println("in login filter");
		if(request instanceof HttpServletRequest){
			HttpServletRequest req = (HttpServletRequest) request;
			
			HttpSession session = req.getSession(false);
			if(session == null) System.out.println("session is null");
			if(session != null && session.getAttribute("userid") != null){
				// pass the request along the filter chain
				chain.doFilter(request, response);
			}else{
				/*ServletContext context = config.getServletContext();
				context.getRequestDispatcher("/login").forward(request, response);*/
				if(response instanceof HttpServletResponse){
					HttpServletResponse resp = (HttpServletResponse) response;
					resp.sendRedirect("../login");
				}
			}
		}
		
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		this.config= fConfig;
	}

}
